Deduce that ;

Can someone start me off please?

Thanks!

this is part 'b' of the question, I just realised you might actually need the first part, which I have already done.

part a is;

use the identity to that show that

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- December 15th 2009, 11:54 AMTweetytrig indentity proof help,
Deduce that ;

Can someone start me off please?

Thanks!

this is part 'b' of the question, I just realised you might actually need the first part, which I have already done.

part a is;

use the identity to that show that

- December 15th 2009, 12:09 PMpickslides
I would try

Therefore

Now expand and group like terms. - December 15th 2009, 12:22 PMIsomorphism
Actually you were just one step away from the answer.

Use this:

- December 15th 2009, 12:36 PMldx2
In your part A question you didn't show that :

You got this solution :

- December 15th 2009, 12:58 PMTweety